Change 441589 had a related patch set uploaded (by MarcoAurelio; owner: MarcoAurelio):
[mediawiki/extensions/MwEmbedSupport@master] Note that the code of this extension was merged into TimedMediaHandler

Mentioned in SAL (#wikimedia-operations) [2018-06-26T18:14:09Z] <marxarelli> scap sync for testwiki is currently failing on l10update due to MwEmbedSupport's deprecation but no change yet to mediawiki/extensions to remove the extension. blocking train on T197918

Just for the sake of clarity (& talking about the code in the 'master' branch, as archiving doesn't happen on REL branches). Can we safely proceed to finally archive this or do you still need to keep the extension.json and the PHP empty entry point? Regards.

Just for the sake of clarity (& talking about the code in the 'master' branch, as archiving doesn't happen on REL branches). Can we safely proceed to finally archive this or do you still need to keep the extension.json and the PHP empty entry point? Regards.

We can. REL1_31 now doesn't depend on this, and the TMH volunteer community (such as it is) doesn't do support for releases anyway.